David Boreanaz, 'Buffy the Vampire Slayer'

FOX/WB

Then: Brood, Angel! Brood! Angel, a vampire cursed with a soul, was doomed to an eternity of unhappiness -- until he slept with Buffy, at which point he experienced true joy and his soul was revoked, turning him back into Angelus, the bloodthirsty, manipulative vampire he truly is. (You're welcome, Stefan Salvatore). Of course, he went on to have his own noir-esque spinoff, where he ran Angel Investigations in L.A. Now: Boreanaz continues to charm TV audiences while investigating things! This time, he's FBI agent Seeley Booth on "Bones," airing Mondays at 8 p.m. on FOX. We do not recommend following Boreanaz on Twitter, though. It's just disappointing, you know?

Then: Brood, Angel! Brood! Angel, a vampire cursed with a soul, was doomed to an eternity of unhappiness -- until he slept with Buffy, at which point he experienced true joy and his soul was revoked, turning him back into Angelus, the bloodthirsty, manipulative vampire he truly is. (You're welcome, Stefan Salvatore). Of course, he went on to have his own noir-esque spinoff, where he ran Angel Investigations in L.A. Now: Boreanaz continues to charm TV audiences while investigating things! This time, he's FBI agent Seeley Booth on "Bones," airing Mondays at 8 p.m. on FOX. We do not recommend following Boreanaz on Twitter, though. It's just disappointing, you know?